{"cve":"CVE-2008-1897","nvd":{"published":"2008-04-23T16:05:00.000","modified":"2026-06-16T22:52:42.703","status":"Modified","description":"The IAX2 channel driver (chan_iax2) in Asterisk Open Source 1.0.x, 1.2.x before 1.2.28, and 1.4.x before 1.4.19.1; Business Edition A.x.x, B.x.x before B.2.5.2, and C.x.x before C.1.8.1; AsteriskNOW before 1.0.3; Appliance Developer Kit 0.x.x; and s800i before 1.1.0.3, when configured to allow unauthenticated calls, does not verify that an ACK response contains a call number matching the server's reply to a NEW message, which allows remote attackers to cause a denial of service (traffic amplification) via a spoofed ACK response that does not complete a 3-way handshake.  NOTE: this issue exists because of an incomplete fix for CVE-2008-1923.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-287"],"references":["http://bugs.digium.com/view.php?id=10078","http://downloads.digium.com/pub/security/AST-2008-006.html","http://secunia.com/advisories/29927","http://secunia.com/advisories/30010","http://secunia.com/advisories/30042"],"products":["asterisk:asterisk_appliance_developer_kit","asterisk:asterisk_business_edition","asterisk:asterisknow","asterisk:open_source","asterisk:s800i"],"source":"nvd","synced_at":"2026-10-19T19:51:11.071189229+00:00"},"epss":{"cve":"CVE-2008-1897","score":0.02743,"percentile":0.86176,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}